Phosphor-converted light-emitting diode based on ZnO-based heterojunction

A phosphor-converted light-emitting diode (LED) was realized by coating BaMg2Al16O27:Eu2+·Mn2+ and (SrCaPO4)·B2O3:Eu2+·Na+ phosphors onto an n-ZnO/i-MgO/p-GaN heterojunction diode. Two emission bands at around 450 and 520 nm were observed in the phosphor-converted LED under the injection of continuous current. By analyzing the optical properties of the heterojunction diode and phosphors, it is concluded that the emission at 450 nm comes from (SrCaPO4)·B2O3:Eu2+·Na+ phosphor, while the one at 520 nm comes from BaMg2Al16O27:Eu2+·Mn2+ phosphor under the excitation of the light emitted from the n-ZnO/i-MgO/p-GaN heterojunction diode. The results reported in this paper may provide a route to ZnO-based phosphor-converted LEDs for future lighting or displaying purpose.